I have a stock 69 camaro that has the dual fuel lines, 3/8 inlet and 1/4 in return. I am looking at going to a single line only and removing the return. I also am thinking about putting on a in line filter.
I use the Edelbrock 1901 Quadrajet 4-barrel carb, on a 350/300hp, which also has a filter.
What are the opinions?

I may be wrong but I believe if you have a tank set up with a return line and a vented system you have to leave it that way without a vapor lock problem. If Doc or Poncho is listening in they can correct that if I'm wrong.

You do not have to run the "return" line. You can run a single line but, the tank must be vented (either the cap or another vent). If not you will create a vacuum and you will not be able to pump fuel.

Thanks for a lots of info:
I am running the single line because I have a Holley mechanical pump that is not set up for a return line and I have a new single line sending unit with a new fuel tank. I don't like the setup on the return line between the carburetor and the fuel pump.

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